Radiation of an Antenna Enclosed by a Spherical Radome Made of an Orthorhombic Dielectric-Magnetic Medium

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Open Journal of Antennas and Propagation Pub Date : 2024-08-21 DOI:10.1109/OJAP.2024.3446914
Hamad M. Alkhoori;Mousa Hussein
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Abstract

The radiation of a structure comprising a spherical radome enclosing an antenna and made of an orthorhombic dielectric-magnetic medium is treated semi analytically in this paper. Inside the radome, the radiation field phasors due to the antenna and reflected field phasors due to the radome are expanded into vector spherical wave functions of the radome’s medium. This yields two sets of unknown expansion coefficients: the radiation-field expansion coefficients, and the reflected-field expansion coefficients. The radiation-field expansion coefficients are obtained in terms of the current distribution in the antenna upon using the bilinear-form dyadic Green functions of the radome’s medium. Outside the radome, the exterior field phasors due to the radome and the antenna are expanded into the conventional vector spherical wave functions of free space, yielding unknown exterior-field coefficients. Application of standard boundary conditions across the radome’s surface yields the reflected and exterior-field coefficients in terms of the radiation-field coefficients, from which the radiation-field resistance and gain of the radome-antenna structure are calculated. For numerical illustration, as a nontrivial example, we considered a toroidal antenna carrying a uniform current distribution. The role of the anisotropy of the radome on the radiation resistance of the toroidal antenna is dictated by (i) the electrical size of the radome, (ii) the radome’s relative impedance, and (iii) the distinguished axis of the radome’s medium. Moreover, those factors can be used in shaping the gain pattern, as well as in raising or lowering the maximum gain.
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由正交介电磁介质制成的球形天线罩包围的天线的辐射
本文以半分析方法处理了一个由正交介电-磁介质构成的、包围天线的球形天线罩结构的辐射问题。在天线罩内部,天线的辐射场相位和天线罩的反射场相位被扩展为天线罩介质的矢量球面波函数。这将产生两组未知的扩展系数:辐射场扩展系数和反射场扩展系数。辐射场扩展系数是根据天线中的电流分布,利用天线罩介质的双线性二元格林函数得到的。在天线罩外部,天线罩和天线的外部场相位被扩展为自由空间的传统矢量球面波函数,从而得到未知的外部场系数。在天线罩表面应用标准边界条件,就能得到以辐射场系数表示的反射场和外部场系数,并由此计算出天线罩-天线结构的辐射场电阻和增益。为了进行数值说明,作为一个非简单的例子,我们考虑了一个携带均匀电流分布的环形天线。天线罩的各向异性对环形天线辐射阻抗的作用由以下因素决定:(i) 天线罩的电气尺寸;(ii) 天线罩的相对阻抗;(iii) 天线罩介质的区分轴。此外,这些因素还可用于形成增益模式以及提高或降低最大增益。
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来源期刊
CiteScore
6.50
自引率
12.50%
发文量
90
审稿时长
8 weeks
期刊最新文献
Front Cover Table of Contents Guest Editorial Introduction to the Special Section on Women’s Research in Antennas and Propagation Section (WRAPS) IEEE ANTENNAS AND PROPAGATION SOCIETY IEEE Open Journal of Antennas and Propagation Instructions for authors
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